Walnuts are the tree nut with the highest concentration of alpha-linolenic acid (ALA), a plant-based omega-3 fatty acid, according to dietary data cited by nutrition researchers.
A one-ounce serving – approximately 14 walnut halves – is the quantity commonly referenced in studies exploring the health effects of walnut consumption, according to a 2026 review of the scientific literature [1]. Other nuts, such as pecans, hazelnuts and macadamias, provide substantially lower amounts of ALA, typically less than 0.5 grams per serving, though exact figures vary by cultivar and growing conditions, officials said.
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